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2 Sheets-Shoal. F. W; GOY. APPARATUS FOR MOLDING SAND PAPER. No. 325,789. Patented Sept. 8,1885.

'N. PETERS, FhMo'Lilhagrapher. Wuhinglnm I10.

P. W. OOY. APPARATUS 'FOR MOLDING SAND PAPER.

2Sheets-Sheet 2.

(No Model.)

Patented Sept.. 8, 1885.

IFlN/E fl Eur.

driving-gear.

UMTED STATES PATENT ()FEICE.

EREDERIoK w. OOY, OF BOSTON, MASSACHUSETTS, AssieNo To GEORGE H. r. FLAGG, TRUSTEE, OF SAME PLAGE.

APPARATUS FOR MOLDING SAND-PAPER.

SPECIFICATION forming part of Letters Patent No. 325,789, dated September 8, 1885.

Application filrd'April 9, 1883. (No model.)

To all whom it may concern.-

Be it known that I, FREDERIoK W. CoY, of Boston, in the county of Suffolk and: State of Massachusetts, have invented new and useful Apparatus for Molding Sand-Paper, of which the following is a specification.

Strips of sand-paper (including in this term sand and emery paper, and cloth and like sheet material having an abrasive surface) have long been in the market in the form of a coil, generally several yards in length, the outer surface of the strips being convex and the inner surface concave, so as to fit the convex periphery of the wheel on which such abrasive strips are used; and such sand-paper is well known to the trade as molded sandpaper. Practical difficulties have been found in producing this article; and my invention is a new method of manufacturing it, the main feature of which consists in putting the strip under tension over the convex periphery of adisk or segment of a disk.

In the accompanying drawings, which illustrate a machine for practicing my invention in the best way now knownto me, Figure lis a top view showing the best arrangement of the mechanism and devices, a portion of the frame being removed to show parts of the Fig. 2 is a section on line was of Fig. 1. Fig. 3 is a View of one of the parts detached, and Fig. 4 is a sectional view of the finishing and smoothing roll and its frame.

A is the frame that supports the various parts.

B is a reel, on which is a roll of sand-paper of the proper width.

O 0 area pair of rolls for moistening the strip as it leaves the reel B. The lower roll, 0, runs in water in a tank, 0, and, being covered with felt or the like, moistens the smooth side of the strip.

D is a horizontal guide-roll, around which the strip passes, and by means of which: it is turned from a horizontal to a vertical plane for more convenient presentation tothemolding devices- 2 r F F is a tension device adjusted to the proper tension by means of a spring, f,' acting on the lever f pivoted at f A nut and screw,

A disk, G, (shown detached in Fig. 3,) has a convex periphery, over which the strip of sand-paper is pulled by the feed-rolls J J.

K is a guide-roll,and L a finishing-roll, both of which aid in the operation of molding the sand-paper strip, and also enable it to better bear the strain requisite to pull it over the convexperiphery of the disk G and through the tension device F F.

It will be seen that in carrying out my invention the essential features are a disk, either a full circle or only a segment, with a convex periphery of the proper width and convexity in view of the width of the strip, and means for pulling the strip over this convex surface while the strip is under a proper tension. It is also better that friction shall be produced between the smooth side of the strip and the convexisnrface. Straining the strip over and moving it past the convex surface not only bends the strip along its length or into a trough shape, but also elongatesj it along. its middle and bends it across its length, and thereby molds it into a convex form on its abrasive side and a concave form on its smooth side, and this form is given mainly by e1on-. gating the strip along its middle, leaving the edges of the strip practically free from puckersa The convex surface on which the strip is strained and moved may be stationary as a segment of a metal disk with a convex periphery or may be a full disk; but I prefer to give it a motion opposite to the motion of the strip over it, as thereby the friction between it and the inner surface of the strip is -very greatly increased, and I find in practice that this increased friction is desirable. Y The tensiondevice may be wholly separate from the convex periphery of the disk, as

In order to get a considerable circumferen edges.

tial contact between the convex periphery of the disk and the inner surface of the strip without an inconvenient arrangement of the feed-rollsJ J in relation to disk G, I have devised the guide-roll K, which is also a disk with a convex periphery, but so arranged with relation to the disk G that the molded strip, when passing from G to K, will be turned inside out-that is, have its smooth surface convex and its abrasive surface concave. This is in order that the strain of the feed-rolls pulling the strip forward and the tension device tending to hold it back shall be along the middle of the strip, and not tend to stretch it at the The strip, after it leaves the guide-roll K, is of courseturned right side out by c011- tact with feed-roll J, which is also a disk with a convex edge, and it is held in close contact with feed-roll J, not only by feed-roll J, but also by the finishing-roll L. This finishingroll should for the best,results bear only near the edges of the strip, and the feed-roll J only near the middle, as shown in Figs. 2 and 4, and the finishing-roll should becushioned, as illustrated in Fig. 4, with felt coyered with leather, with cushions of vulcanized rubber.

The acting surface of feed-roll J is best made of leather rings clamped together so as to bear cdgewise on the strip of sand-paper. The end of the sand-paper strip. is directed downward after it passes the feed-rolls J J and into a cylinder, M, which is closed at its rear end and stands upon table M, which has a rotary motion imparted to it sufficient to prevent buckling of the molded strip, for the strip, when it leaves the feedro1ls J J, must either be wound into a roller else into a loose spiral; otherwise it will buckle.

The operation is as follows: The strip of sandpaper is placed in the form of a roll upon the reel B, and its outer end is carried between the rolls 0 G of the moistening apparatus; thence around the guide-roll D and between the tension-rolls F F; thence over disk G, under guide-roll K, over J, and between J and L and J and J. In order to introduce the strip more readily, the lever f is pulled against its spring, thereby separating rolls F F; and the finishing-roll L is swung out of the way by throwing rod Z to the right (see Fig. 1) on its fulcrum Z, which releases frame Z". After the end of the strip is nipped between rolls J J, the finishing-roll L is brought to bear upon the strip and secured by swinging back the rod Z the sleeve l acting against the inner surface of the forked arms of the frame Z by means of spring Z", the tension of which is adjusted by nut Z". The strip is then pulled along by the feed-rolls J J, being strained over feed-roll J, and also held closely to that feed-r011 by means of the finishing roll L, also strained over guideroll K and disk G, and held back with force sufficient to give the desired strain by the tension-rolls F F. The machine continues in operation until the whole strip is molded. Of course, when the inner end of the strip leaves the moisteningrolls, the attendant so guides it that it is properly presented to the tension-rolls F F. About a foot on the average at each end of the strip is not properly molded, and is cut off.

On reference to Fig. 3, it will be seen that the disk G is toothed, and that each tooth is backed off, and this is the best form of disk; but this is a detail and not of the essence of my invention, which in its essence is an apparatus having a tension to hold the strip back, and a feed to feed it forward against the resistance of the tension, in combination with a convex surface over which the strip is strained by the feed pulling against the ten- S1011.

It is not material, except as to perfection of result, that the details of construction shown in the drawings be followed.

It is obviously desirable to have the strip in a longitudinal plane when it is acted upon by the moistening apparatus, and I find it better in practice to have it in avertical plane when it is acted upon by the molding apparatus, and hence the use of the horizontal guideroll D; but this part of my invention consists in the combination of a moistening apparatus with a tension device and a feed adapted to strain the moistened strip over a convex surface, and is not limited to the specific arrangement shown.

When abrasive cloth is molded instead of this is most readily done by a gas-jetinaway too well known to require description.

The roll J is mounted on lever j, and its pressure against roll J is regulated by an adjustable spring, j as clearly shown in Fig. 1.

The roll L is made in two parts for adjustment to strips of different widths,and this adjustment is effected by turning the hub Z,

which has a right and left screw-thread upon it fitting corresponding threads on the two parts of the roll L. The set-screws Z are set up after the two parts are adjusted. 'The wheel L is supported upon shaft Z mounted in frame Z". Each part of wheel L has an annular cushion with a concave periphery (see Fig. 4) secured to it, and this cushion is best made of felt cut to shape and covered with leather.

To make the cushion more durable I cement a strip of leather over the working-face, as shown in Fig. 4, and when this is worn out it is removed and a fresh one substituted.

Vhat I claim as my invention is- 1. The apparatus above described for molding sand-paper, consisting, essentially, of the disk with a convex periphery and the tension and feeding devices, substantially as described, adapted to strain the abrasive strip overthe convex surface as it is fed through the appa ratus, all substantially as set forth.-

each of the two parts having a peripheral to cushion, as and for the purposes specified.

5. 111 a sandpaper-molding apparatus, substantially such as described, the guide-r011 K between the disk G and feed-rolls J J, as described.

. FREDK. W, 0051.

Witnesses:

J. E. MAYNADIER, J 01m R. SNOW. 

